With Opera you need to let it load the page before clicking stuff on the page. Clicking too early sxometimes causes the app to crash. There could be some configs about cache too. And then there is that weird "watchdog" thing lurking somewhere inside fremantle operating system which can cause device to stuck/crash. There is a way to change/prevent that watchdog to jump on you and I have couple of times asked from the gurus about it and mazybe got an answer too but have never really understood what it is and how to turn it off. I think it is related with ram consumption or cpu but not sure. I think that can cause problems also with Opera.